Progress of plastic deformation and dislocation accumulation from the tip of U-shaped notch in models of α phase titanium alloy undercyclic loading

Abstract

Plastic slip deformation in the vicinity of the tip of U-shaped notch in α phase titanium single crystal models subjected to cyclic tensile load is analysed by a crystal plasticity finite element method. Crystal orientation is defined so as that the basal plane is parallel to the specimen surface and a prismatic slip system operate as the primary one under tensile load. Results show that slip deformation develop in two thin strip shaped regions extending from the notch root during loading and these plastic shear strain does not diminish upon unloading.